Mining machine



F. A. LINDGREN MINING MACHINE Dec. 18, 1934.

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Dec. 18, 1934.

F. A. LINDGREN MINING MACHINE Filed Oct. 29, 1930 7 Sheets-Sheet 4 QM NV Dec. 18, 1934. F A QQD EN 1,984,487

MINING MACHINE Filed Oct. 29, 1930 '7 Sheets-Sheet 6 @Qwwwe k Dec. .18, 1934. F UNDGREN 1,984,487

MINING MACHINE Filed Oct. 29, 1930 7 Sheets-Sheet 7 Fig/0 {[10 H 1 J17 11776171 0,- JJ'J/h? a? [17/49/172 J15 6L v Patented Dec. 18, 1934 UNITED, STATES PATENT OFFICE MINING MACHINE Application October 29, 1930, Serial No. 491,861 32 Claims. (01. 262-28) This invention relates to improvements in mining machines and more particularly to improvements in a truck mounted type of'coal mining machine adapted for use in restricted places, for

cutting a kerf in the mine wall at various positions from the mine bottom to the mine roof.

My invention has as its principal object to pro vide a machine of simple and rugged construction suitable for use in narrow entries which is of a short wheel base and length so as to be able to negotiate short turns, and which is provided with frictionally controlled plural speed power actuating means for moving the cutter bar about a vertical axis for cutting an arcuate kerf in the coal. 1 Another object of my invention is to provide a machine of a compact rugged construction which is adjustable to cut a kerf adjacent the mine bottom or the mine roof. Another object of my invention is to provide novel frictionally controlled plural speed geared'reduction connections for effecting the translational feeding and travelling operations of the machine and laterally swinging and feeding the cutter bar about a vertical axis, which geared reduction connections are so arranged as to occupy a minimum amount of space.

Other objects of my invention will appear from time to time in the following description embodying the several features of my invention.

A prior application filed by me April 2, 1930,

Serial Number 441,085, relates to a mining machine of the class set forth in my present invention. My present invention differs from my prior invention in the arrangement of the driving mechanism for performing the various functions,

and in section, and'with the cutter bar arrange was to cut adjacent the mine bottom;

Figure 4 is an enlarged partial fragmentary top plan view of the device shown in Figure 1, with parts broken away and in section;

My invention may bemore clearly understoodv one embodimentv tending shaft 14 journalled in support means 15 device shown in Figure 1 with parts broken away Figure 5 is a sectional view taken on line 5-5 of Figure 4;

I Figure 6 is a sectionalview taken on line 6-6 of Figure 4;

' Figure 7 is a sectional view taken on line 7-7 of Figure 4;

Figure 8 is an enlarged fragmentary top plan view of the rearward portion of the device shown in Figure 1, with parts broken away and in section;

Figure 9 is an enlarged sectional view taken on line 9-9 of Figure 8;

Figure 10 is an enlarged partial fragmentary planview of the forward portion of the embodiment of my invention shown in Figure 1, with parts broken away and in section to more clearly show the details of my invention; and

Figure 11 is an enlarged partial fragmentary plan view of the rearward portion of the embodiment of my invention shown in Figure 1, with parts broken away and in section to more clearly show the details of my invention.

Like numerals refer to like parts throughout the various figures.

Referring now in particular to the drawings, the embodiment of my invention illustrated comprises a truck 3 supported on wheels 4 and axles 5 for movement about the mine on the mine rails. The truck 3 is provided with vertically extending parallel spaced guides 6 on each side thereof for supporting a cutting element '7 forv vertical movement therealong.

The cuttingelement 7 includes a motor 8 disposed centrally thereof having cutting mechanism disposed forwardly of said motor including a cutter head 9 and feeding and truck driving mechanism 10 disposed rearwardly of said motor.

The motor 8 may be of any type well known to the art but is herein preferably shown as an electric motor provided with an armature shaft 11 having an armature pinion 12 fixed to its forward end; The armature pinion 12 meshes with and drives a spur gear 13 on a longitudinally exfor the cutter head 9 The longitudinal shaft 14 is provided with a helical gear 16 near the central portion thereof, which helical gear meshes with and drives a helical gear 17 keyed on a sleeve 18 freely mounted on a transversely extending shaft 20and journaled in a bearing support 19 integralwith the support means 15.

The parallelspaced vertically extending guides 6 are each provided with an inwardly facing rack 21. These racks are engaged by pinions 23 spaced adjacent opposite ends of the motor 8 on longitudinal shafts 24, which shafts are journaled in the cutting element 7 adjacent opposite sides of said motor. The forward ends of the longitudinal shafts 24 extend forwardly beyond the motor 8 and have worm gears 25 keyed thereon, which worm gears mesh with and are driven by worms 26 fixed on the transversely extending shaft 20 adjacent opposite ends thereof.

Means are provided for selectively connecting the transversely extending shaft 20' with the helical gear 1'?- and sleeve 18, which means comprises a suitable clutch herein preferably shown as a; friction clutch 2'7 of the cone type so that engagement of said clutch causes the transversely extending shaft 20 to be driven .fromthearrria ture shaft 11. rotation of the armature shaft 11 and engagement of the friction clutch 2'7 that the shaft.

20 is driven thereby and in turn drives the longi-.

tudinal shafts 24 and rotates the pinions23 to" Referring now in'particular to the cutter head:

9, said cutter head extends beyond the support means 15 and is provided with a portion 29'which rests on the top portion of said support means and extends beyond each side of said support means and a depending cylindricalportio-n. 36 which is slidably movable within said support means. An internal gear 31 is keyed to the inner periphery of a cutter bar support means 32', which cutter bar support means is journaled within the portion 29 for rotatable movement with respect thereto and is provided with a vertically ex-,

tending hub portion 33. The cutter bar support means 32 is provided with a shoulder 34 on its top portion adjacent its outer periphery, which is engaged by an annular ring 35 fixed to the top portion of the portion 29 of the cutter head 9 to prevent vertical movement of said cutter bar support means and internal gear 31 within the portion 29 of the cutter head 9.

The cutter bar support means 32 is provided with an upwardly extending portion 36 for sup-- porting a cutter bar 3'7 so'that said cutter bar may be rotatably moved upon movement of the internal gear 31. The cutter bar 37 is of an ordinary construction and has a cutter chain 38 movable thereabout, which cutter chain is driven from a cutter chain sprocket 39fixed on a sleeve 41 journaled within the hub 33 of the cutter bar support means 32.

The sleeve 41 is engaged by a splined shaft 42 coaxial with a hub 43 of a bevel gear 44. The. hub 43 of the bevel gear 44 extends upwardly and downwardly from said bevel gear and isjournaled within the support means 15 for the cutter head 9. The lower portion of the splined shaft 42 is hollow and has a shaft 45 feathered therein for vertical movement with respect thereto. The shaft 45 is journaled at its lower end within a plate 46 which extends across the support means 15 for the cutter head 9.

the hub 43 of the bevel gear 44' with the shaft 45 for driving said shaft and the splined shaft '42,;

Thus it may be seen that upon.

48 at its upper end engageable with jaws 49 depending from the hub 43 of the bevel gear 44. The clutch collar 47 is moved along the shaft 45 to engage the jaws 48 with the jaws 49 for driving said shaft from the bevel gear 44 by a suitable system of levers in an ordinary manner not herein shown.

The bevel gear 44 is, in turn... driven from the, motor 8 by means of a bevel pinion 51 meshing therewith and fixed on and driven from the froward end of the longitudinal shaft 14.

Referring now in particular to the means for rotating the cutter bar 37 about the axis of the hub 33 at a plurality of frictionally controlled speeds from the motor 8, the longitudinally extending: shaft I4 has a spur pinion 52 keyed thereon, which pinion meshes with and drives an idler gear 53 on a stud 54 journaled in the support means 15 for the cutter head 9. The idler gear53 meshes with and drives a spur gear 55 keyed on asleeve 56 freely mounted on a longitudinally extending shaft 53.

Suitable frictionally controlled plural speed gear reduction means are provided for driving the longitudinally extending shaft 58 from the spur gear 55, which means may be of any type Well known to the art but-Which means is herein shown as africtionall-y controlled planetary gear reduction mechanism 59. This planetary gear reductionmechanism includes a casing 60 having a hub 61 freely mounted on the sleeve 56 and journaled in the support means 15 for the cutter head 9. The sleeve 56 extends within the casing 60 and is provided with a sun gear 62 on its inner end. i The sun gear 62 meshes with and drives planetary pi-nions 63 mounted on pins 64 journaled within a cage 65 rotatable within the casing 60. The planetary pinions 63 mesh with an internal gear 66 keyed within the casing 60. Planetary pinions 6'7 are fixed on the pins 64 adjacent the planetary pinions 63 and are driven therefrom. The planetary pinions 67 mesh with anddrive an internal gear 68 journaled within the casing 60. The internal gear 68 is provided with an outwardly extending hub 69 which is journal'ed in a bearing support 71 fixed to the support means 15for the cutter head 9.

A friction band '72 is provided to engage the outer periphery of the casing 60 to hold said casing from rotation or allow said casing to. slip upon overload of the planetary gearing mechanism. .This friction band is engaged with the outer periphery 'of the casing 60 by a suitable system of levers not herein shown since it is no part of my invention, so that the point at which the casing 60 will slip within the friction band 72 may be varied to vary the speed of rotation of the planetary gearing mechanism.

Means are provided to connect the longitudinallyextend-ing shaft 58 with either the cage 65 or the internal gear 68'for driving said shaft at a high or' low speed, which means herein comprises a clutch collar 73 feathered on the longitiidi'nally extending shaft 58. This clutch collar isprovided with jaws 74 engageable with jaws 7 5 keyed on a hub 76 of the cage 65 for driving the shaft 58 ata low speed or jaws 77 extending inwardly from the hub 69 of the internal gear 68 foradiiving said shaft at a. frictionally controlled H higher speed. The clutch collar 73 is moved along Means are provided for operatively connecting.

theshaft 58 for engaging the jaws '74 with either the jaws 75 or the jaws '77 by a suitable system of levers in a usual manner (not shown).

The longitudinally extending shaft 58- is provided with a worrn 78 near its forward end which Lam is? meshes with and drivesiaworm gear 79 fixed on a hub 81 journaledat its end by means of suitable ball bearings indicated at 82. A. vertical shaft 83 is journaledwithin a boss 84 depending from the portion 29 of the cutter head 9. The lower portion of the vertical shaft 83 is splined and engages the inner periphery of the hub 81. A spur pinion 85 is fixed on the top portion of the vertical shaft 83 and meshes with and drives the internal gear 31.

It may now be seen that the internal gear 31 and cutter bar 37 may be rotatably. moved about the axis of the hub 33 from the motor 8 for moving said cutter bar in the coal so that said cutter bar may cut an arcuate kerf therein andthat said cutter bar may be moved at a plurality of frictionally controlled speeds through the planetary geared device 59 controlled by the friction band 72 which provides a safety means to control the rate of feed of said cutter bar and stop feeding movement of said cutter bar upon overload thereof; as, for instance, when the cutter chain 38 encounters sulphur balls or other hard material in the coal.

It should also be noted that the cutter bar supporting member 32 is so supported and journaled within the portion 29 of the cutter head 9 that the cutter bar 37 may be pivotally moved about an arc of 360 degrees. Thus when it is desired to travel about the mine from working place to working place, the cutter bar 37 may be positioned so as to extend rearwardly along the cutting element 7. This shortens the travelling length of the machine and enables said machine to be readily moved through narrow mine entries.

Means are provided for vertically moving the cutter bar 37 with respect to the support means 15, which means herein comprise a plurality of threaded members 87 operatively connectible with the motor 8. These threaded members 87 are pivotally connected to ears 88 extending from each side of the portion 29 of the cutter head 9. A hub 89 of a worm gear 90 is threaded on each member 87. The worm gears 90 and hubs 89 are journaled within and supported from translational movement with respect to the support means 15 for the cutter head 9 by casings 91 integral with said support means and are driven by means of worms 92 on the forward end of longitudinal shafts 93.

The longitudinal shafts 93 are selectively connectible with the motor 8 and are simultaneously driven therefrom by means of worm and worm gear drives 94 on opposite ends of a transversely extending shaft 95. The shaft 95 is driven from the longitudinally extending shaft 14 by means of a helical gear 96 which meshes with and is driven from the helical gear 16. The helical gear 96 is keyed on a sleeve 97 journaled within the bearing support 19 and freely mounted on the transverse shaft 95. Suitable clutch means are provided to operatively connect the sleeve 97 with the transverse shaft 95 for driving said shaft from said sleeve and the helical gear 96, which herein comprises a friction clutch and is herein preferably shown as being a cone clutch 98 of an ordinary construction.

When the cone clutch 98 is operatively connected to the sleeve 97 the transverse shaft 95 and longitudinal shafts 93 are driven from the armature shaft 11 which rotates the worm gears 90 and moves the threaded members 87 through the hubs 89 of said worm gears to vertically move the cutter head 9 with respect to the support means 15. This provides an adjusting means for the cutter bar 37 to effect additional adjustment of said cutter bar when the cutting element 7 is in an extreme position along the guides 6.

The cutting element 7 is so arranged that it may be removed from the guides 6 and placed in said guides in an inverted position so that the cutter bar 37 depends from the cutter head 9 as is illustrated in Figures 2 and 3.

In order to invert the cutting element 7 in the guides 6, said cutting element is moved to an extreme elevated position in said guides by means of the pinions 23 meshing with the racks 21 and lifted from said guides by means of a crane or any other suitable means. The cutting element 7 is then inverted with the cutter bar 37 extending downwardly from the cutter head 9 instead of upwardly from said cutter head and aligned with the guides 6 so that the pinions 23 mesh with the racks 21. The pinions 23 are then driven from the motor 8 to lower the cutting element 7 in the guides 6 to a position such as is shown in Figure 3.

Thus when the cutting element 7 is inverted in the guides 6 so that the cutter bar 37 depends from the cutter head 9, said cutter bar and cutter head will be in the position indicated by dotted lines in Figure 3. When it is desired that a out be made adjacent the mine bottom the cutter bar 37 and cutter head 9 are lowered by means of the threaded members 87 which are vertically moved by driving the worm gears 90 from the motor 8.

Referring now in particular to the feeding and truck driving mechanism disposed rearwardly of the motor 8, the armature shaft 11 has a pinion 99 on its rearward end which meshes with and drives a spur gear 100 keyed on a sleeve 101 freely mounted on a longitudinally extending shaft 102. The shaft 102 is fixed in a support frame 103 for the feeding and truck driving mechanism at its forward end and has a casing 104 of a planetary gear reduction mechanism 105 freely mounted on its rearward end. The casing of this planetary gear reduction mechanism is provided with a hub 106 journaled in a bearing support 107 supported on the support frame 103.

The planetary gear reduction mechanism 1G5 is of an ordinary construction and is similar to the planetary gear reduction mechanism 59 so will only be described insofar as is necessary to clearly set forth my invention. A sun gear 109 is provided on the rearward end of the sleeve 101 and meshes with and drives planetary pinions 110, which planetary pinions are supported in a cage 111 and mesh with an internal gear 112 integral with the casing 104. Planetary pinions 113 are integral with the planetary pinions and mesh with an internal gear 114 adjacent the internal gear 112 and journaled within the casing 104 for rotatable movement with respect thereto.

A friction band 115 is provided to engage the casing 104 to hold said casing from rotation or allowsaid casing to slip upon overload of the planetary gearing mechanism. This friction band is tightened or loosened on this casing by means of a suitable system of levers in an ordinary manner, not herein shown, so that the point atwhich the casing will slip within said friction band may be varied.

The cage 111 has clutch jaws 117 fixed to its hub. The internal gear 114 is journaled on the hub of the cage 111 and has clutch jaws 118 integral therewith. A spur gear 119 is freely mounted on the sleeve 101 adjacent the hub of the cage 111 and has clutch jaws 120 slidably supported thereon for engagement with the clutch jaws 117 or 118 for driving said spur gear ata frictionally controlled low speed from the cage 111 or at a frictionally controlled higher speed from the ;internal gear 114. I

The spur gear 119 meshes with and drives a spur gear 121 keyed on the forward end of'a longitudinally extending shaft 122. A worm 123 is cut integral with the longitudinally extending shaft 122 and meshes with and drives a worm gear 124 on a transverse shaft 125. Astudshaft 127 is journaled within the support :frame'103 and has an end 128 which fits within theend of the transverse shaft 125. A spur pinion 129 is keyed on the outer end of the studshaft 127 and meshes with an internal gear 130. The internal gear 130 is connected with a winding drum 131 journaledon a stud 132 .for driving :said drum.

Means are provided for selectively connecting the stud shaft 127 with the transverse shaft 125 for driving said stud shaft at a plurality of predetermined frictionally controlled speeds, which means herein comprises a clutch collar 133 feathered on the transverse shaft 125 and having clutch jaws 134 thereon engageable with clutch jaws 135 integral with the stud shaft 127.

A flexible cable 137 is adapted to be connected with and wound on "the winding drunrISl. This cable may be threaded rearwardly of the. mining machine around sheaves 138 and 139 to pull the mining machine along the coal face; as, for instance, when the cutter bar 37 is disposed at right angles to the machine proper and a :kerf is being out along the coal face. Other sheaves 140 are provided on opposite sides of the mining maf chine adjacent the rearward end thereof sothat the flexible cable 137 may be trained forwardly on either side of the mining machine to feed the cutter bar into the coal when it is desired to cut an arcuate kerf in a mine entry.

Referring now in particular to the means for propelling the mining machine about the mine and feeding said machine into thecoal when it is not desired or necessary to use the flexible cable 137, a bevel pinion 141 is keyed on the forward end of the longitudinal shaft 122 and meshes with and drives a bevel gear 142. The bevel gear 142 is provided with a hub 143 extending upwardly and downwardly therefrom and journaled within the support frame 103. The inner periphcry of the hub 143 is splined and is engaged by a splined shaft 144. The lower end of the splined shaft 144 engages the inner periphery of a hub 145 of a bevel gear 146 and is held thereto by means of a pin 147 so that said shaft may be axially moved a limited distance with respect to said hub.

The bevel gear 146 is journaled within a housing 148 integral with the truck 3 adjacent the rearward end thereof and meshes with and drives bevel gears 149. freely mounted on a transverse shaft 150. Suitable jaw clutch means (not shown in detail) are provided for connecting either of the bevel gears 149 with the transverse shaft 150 for driving said shaft from the motor 8 in opposite directions without reversal of the motor.

The outer end of the transverse shaft 150 is provided with a'sprocket 151 connectible with the rearward truck axle and wheels 4 by means of a drive chain 152 and driven sprocket 153. The forward and rearward truck axles are operatively connected together by means of a suitable chain and sprocket drive indicated at 154.

The opposite end of the transverse shaft v150 is provided vrlthsuitable braking means for bolding back the-miningmachine as it is (travelling,

down grade-or completely stopping said machine when desired. Said braking means herein comprises a brake drum 155 keyed on the transverse. shaft 150 and engaged by a. friction band 156. The friction band 156 is tightened or loosened on the brake drum 155 by means of a hand wheel 157 and a suitable system of levers in a usual manner, the details of whichare not herein shown or described since they are no part of my invention.

With reference to Figures 2, 3 and 9, it may be seen that the splined shaft 144 is so arranged that it may be driven from the motor 8 in various positions of vertical adjustment of the cutting element '7 with respect to the truck 3 and that said shaftmay be driven from said motor when the entire cutting element is'in an inverted position with respect to the truck frame so that the cutter bar is positioned adjacent the mine bottom instead of the mine roof.

As has herein been described, it may be seen that the mining machine may be moved about a mine .on the wheels 4 at a plurality of frictionally controlled speeds controlled by'the planetary 105 and that the high speed :may be used for travelling from working place to working place while the slow speed may be used when it is desired to sump the cutter bar into the coal. Thus the cutter bar 37 may be sumped into the coal by means of the wheels; driven from the motor 8 through the frictionally controlled planetary gear reduction mechanism 105 or may be sumped into the'coal by means of the winding drum 131 and flexible cable 137 driven by said motor through said frictionaily controlled planetary gear reduction mechanism or saidcutter bar may be sumped into the coal by both the truck wheels and said flexible cable and Winding drum. Also the-cutter bar 37 may be sumped into the coal by pivotally moving said cutter bar about the axis of the internal gear 31, which cutter bar is moved by the frictionally controlled plural speed planetary geared reduction mechanism 59 driven from the forward end of the motor 8.

, It may thus be seen that a new and improved mining machine has been provided which is especally adapted for use in confined spaces, such as mine entries, which has an invertible cutting element so that a kerf may be out along the mine bottom at various elevations with respect thereto or adjacent the mine roof, and which has a pivotall-y movable cutter bar driven from the same motor which drives the truck driving and feeding mechanism at a plurality of predetermined frictionally controlled speeds.

. Itmay also be seen that while the entire cutting element is vertically movable in guides that additional adjusting mechanism has been provided for the cutter head and cutter bar so that said cutter head and cutter bar may be vertically movable with respect to the cutting element. This provides a means for adjusting the cutter bar so that it may cut adjacent the .mine bottom below the level-of the track or for adjusting said cutter bar so that it may-cut adjacent the mine top when the cutting element is in its extreme upward position in the guides 6.

While I haveherein shown and described one form of my invention, .it will be understood that the construction and arrangement of the various parts may be altered without departing from the spirit and scope thereof. Furthermore, I do not wish to be construed as limiting myself to the specific form illustrated, excepting as it may be specifically limited in the appended claims.

I claim as my invention:

1. In a mining machine, a wheeled truck, a cutting element supported thereon for vertical movement with respect thereto including a motor, feeding mechanism rearwardly of said motor including truck driving mechanism, a cutter head forwardly of said motor having a cutter bar supported thereon for movement about a vertical 'pivotal axis, means driven by the forward end of said motor for moving said cutter bar about said vertical pivotal axis, othermeans driven by the forward end of said motor for moving said cutter bar vertically with respecttosaid motor comprising a plurality of threaded members having connection with opposite sides of said cutter head, and means held from translational movement with respect to said motor threaded on said threaded members and rotatably driven by said motor.

2. In a mining machine, awheeled truck, a cutting element supported thereon for vertical movement with respect thereto including a motor, feeding mechanism rearwardly of said motor including truck driving mechanism, a cutter head forwardly of said motor having a cutter bar supported thereon for movement about a vertical pivotal axis, means driven by the forward end of said motor for moving said cutter bar about said vertical pivotal axis, and other means driven by the forward end of said motor for independently moving said cutter bar vertically with respect to said motor comprising a plurality of threaded members having connection with opposite sides of said cutter head, nuts threaded on said threaded members and held from translational movement with respect to said motor and a geared connection from said motor to said nuts.

3. In a mining machine, a wheeled truck, a cutting element supported thereon for vertical movement with respect thereto including a motor, feeding mechanism rearwardly of said motor including truck driving mechanism, a cutter head forwardly of said motor having a cutter bar supported thereon for movement about a vertical pivotal axis, means driven by the forward end of said motor for moving said cutter bar about said vertical pivotal axis, and other means driven by the forward end of said motor for independently moving said cutter bar vertically with respect to said motor comprising a plurality of threaded members pivotally connectible with opposite sides of said cutter head, a sleeve threaded on each member and held from translational movement with respect to said motor, and a selective geared connection between said motor and sleeves.

4. In a mining machine, a wheeled truck, a cutting element supported thereon for vertical movement with respect thereto including a motor, a cutter head forwardly of said motor having a cutter bar supported thereon for movement about a vertical pivotal axis, feeding mechanism rearwardly of said motor including a plural speed planetary geared reduction device driven from the rearward end of said motor, means driven "from the forward end of said motor for moving said cutter bar about said vertical pivotal axis, and other means driven from the forward end of said motor for moving said cutter bar vertically with respect to said motor comprising a threaded member having connection with said cutter head and motor.

5. In a mining machine, a Wheeled truck, a cutting element supported thereon for vertical movement with respect thereto including a motor,

a cutter head forwardly of said motor having a cutter bar supported thereon for movement about a vertical pivotal axis, feeding mechanism rearwardly of said motor including a plural speed planetary geared reduction device driven from the rearward end of said motor, means driven from the forward end of said motor for moving said cutter bar about said vertical pivotal axis, means driven from the forward end of said motor for elevating said cutting element with respect to said truck, and other means driven from the forward-end of said motor for moving said cutter bar vertically with respect thereto.

6. In a mining machine, a wheeled truck, a cutting element supported thereon for vertical movement with respect thereto including a motor, a cutter head forwardly of said motor having a cutter bar supported thereon for movement about a vertical pivotal axis, feeding mechanism rearwardly of said motor including a plural speed planetary geared reduction device driven from the rearward end of said motor, means driven from the forward end of said motor for moving said cutter bar about said vertical pivotal axis, means driven from the forward end of said motor for elevating said cutting element with respect to said truck, and other means driven from the forward end of said motor for moving said cutter bar vertically with respect to said motor comprising a plurality of threaded members having connection with opposite sides of said cutter head, and means held from translational movement with respect to said motor threaded on said threaded members and driven by said motor.

7. In a mining machine, a wheeled truck, a cutting element supported thereon for vertical movement with respect thereto including a motor, a cutter head forwardly of said motor having a cutter bar supported thereon for movement about a vertical pivotal axis, feeding mechanism rearwardly of said motor including a plural speed planetary geared reduction device driven from the rearward end of said motor, means driven from the forward end of said motor for moving said cutter bar about said vertical pivotal axis including a plural speed frictionally controlled planetary gear reduction device operatively conneotible with said cutter head, other means driven from the forward end of said motor for moving said cutter bar vertically with respect to said motor comprising a threaded member having connection with said cutter head, and means threaded on said threaded member held from translational movement with respect to said motor and driven thereby.

8. In a mining machine, a wheeled truck, a cutting element supported thereon for vertical movement with respect thereto including a motor, a cutter head forwardly of said motor having a cutter bar supported thereon for movement about a vertical. pivotal axis, feeding mechanism rearwardly of said motor including a plural speed planetarygeared reduction device driven from the rearward end of said motor, means driven from the forward end of said motor for moving said cutter bar about said vertical pivotal axis including a plural speed frictionally controlled planetary gear reduction device operatively connectible with said cutter head, means driven from the forward end of said motor for elevating said cutting element with respect to said truck, and other means driven from the forward end of said motor for moving said cutter bar vertically with respect to said motor.

9. In a mining machine, a wheeled truck, a

cutting elementsupported ithereonlfor vertical movement with respect thereto including a motor, a cutterhead forwardly'ofsaidmotor having a cutter bar supported thereon for movement about a vertical pivotal axis,ifeeding m'echanism rearwardly of said motor including a plural speed planetary geared reduction device driven from the rearward end of said motor, means driven from the forward end of said motor forimoving said cutter bar about said vertical pivotal axis including a plural speed frictionally controlled planetary gear reduction device operatively connectible with said cutter head, means driven from the forward end of said motor for elevating said cutting element with respect to said truck, and other means driven from the forward end of said motor for moving said cutter bar vertically with respect to said motor comprising a threaded member having connection with said cutter bar, and means threaded on said threaded member and held from translational movement with respect to said motor and rotatably driven thereby for moving said threaded member through said means.

10. In a mining machine, awheeled truck, a cutting element supported thereon for vertical movement with respect thereto including a motor, a cutter head forwardly of said motor'having a cutter bar supported thereon'for movement about a vertical pivotal axis, feeding-mechanism rearwardly of said motor including a plural speed planetary geared reduction device driven from the rearward end of said motor, means driven from the forward end of said motor for moving said cutter bar about said verticalpivotal axis including a plural speed frictionally controlled planetary gear reduction device'operatively connectible with said cutter head, means driven from the forward end of said motor for elevating said cutting element with respect to said truck, and other means driven from the forward end of said motor for moving said cutter bar vertically with respect to said motor comprising a plurality of threaded members having connection with opposite sides of said cutter bar and means rotatably driven by said motor, threaded on said threaded members and held from translational movement with respect to said motor, for moving said threaded members through said means and-thus vertically moving said cutter bar.

11, In a mining machine, a truck having wheels and axles thereon and a pair of parallel spaced vertically extending guides on each side thereof, a cutting element supported in said guides for vertical movement with respect to said truck including a -motor, a' cutter head forwardly of said motor having a cutter bar supported thereon for vertical movement with respect to said motor and for movement about a vertical pivotal axis, feeding mechanism rearwardly of said motor including truck driving mechanism and a flexible feeding device, means interposed between said truck driving mechanism and flexible feeding device and the rearward end of said motor for selectively driving said truck wheels and flexible feeding device including a plural speed fricticnally control-led planetary geared reduction device, and means interposed between the forward end of said motor and said cutter bar for moving said cutter bar about said vertical pivotal axis including a plural speed frictionall'y controlled planetary geared reductiond'evice.

12. In a mining machinaa truck having wheels and axles thereon and-a pair of parallel spaced vertically extending guides on each side thereof, a cutting element supported in said guides for vertical movement with respect to said truck including a motor, a cutter head forwardly of said motor. having a cutter bar supported thereon for vertical movement with respect to said motor and for movement about a vertical pivotal axis, feeding mechanism rearwardly of said motor includingv truck driving mechanism and a flexible feedingidevice, means interposed between said truck driving mechanism and flexible feeding device and therearward end of said motor for driving said truck and flexible feeding device at a plurality of frictionally controlled speeds including a plural speed frictionally controlled gear reduction mechanism, means interposed between the forward end of said motor and said cutter bar for moving said cutter bar about a vertical pivotal axis at a plurality of frictionally controlled speeds including a plural speed frictionally controlled gear reduction mechanism, and means driven fromithe forward end of said motor for verticallyv moving said cutting element in said guides and independently moving said cutter bar vertically with respect to said motor.

13.: In a mining machinaa truck having wheels and-axles thereon and a pair of parallel spaced vertically extending guides on each side thereof, a cutting element supported in said guides for vertical movement with respect to said truck including a motor, a cutter head forwardly of said motor having a chain carrying cutter bar supported thereon for vertical movement with respect to said motor and for movement about a verticalpivotal axis, feeding mechanism rearwardly of said motor including truck driving mechanism and a flexible feeding device, means interposed vbetweensaid truck driving mechanism and flexible feeding device and the rearward end of said motor for driving said truck and flexible feeding device at a plurality of frictionally controlled speeds including a' plural speed frictionally controlled gear reduction mechanism, means interposed between the forward end of said motor and said cutter bar for moving said cutter bar about a vertical pivotal axis at a plurality of frictionally controlled speeds including a frictionally controlled gear reduction mechanism, and means driven from the forward end of said motor for driving said cutter chain about said cutter bar, vertically moving said cutting element in said guides, andindependently or simultaneously moving said cutter bar vertically with respect to said motor.-

14. In a mining machine, a truck having wheels and axles thereon, and a pair of parallel spaced vertically extending guides on each side thereof, a cutting element supported in said guides for verticalmovement with respect to said truck including a motor, a cutter head forwardly of said motor having a cutter bar supported thereon above the top portion of said cutting element for vertical movement with respect to said cutting element and .for movement about a vertical pivotal axis, feeding mechanism rearwardly of said motor'including truck driving mechanism, means driven from the forward end of said motor for vertically moving said cutting element in said guides, for vertically moving said cutter bar with respectxto said cutting element and for moving said cutter bar about said vertical pivotal axis, and said cutting element being so arranged that it'may be inverted so the cutter bar may project from the bottom thereof instead of the top and cut a horizontal kerf adjacent the mine bottom or at various elevations with respect thereto.

15. In a mining machine, a truck having wheels and axles thereon and a pair of parallel spaced vertically extending guides on each side thereof, a cutting element supported in said guides for vertical movement with respect to said truck including a motor, a cutter head forwardly of said motor having a cutter bar supported thereon above the top portion of said cutting element for vertical movement with respect to said cutting element and for movement about a vertical pivotal axis, feeding mechanism rearwardly of said motor including truck driving mechanism, said truck driving mechanism including a gear driven by said motor and operatively connectible with said truck wheels and axles, means driven from the forward end of said motor for vertically moving said cutting element in said guides, for vertically moving said cutter bar with respect to said cutting element, and for moving said cutter bar about said vertical pivotal axis, and said cutting element being so arranged that it may be inverted so the cutter bar may project from the bottom thereof instead of the top and cut a horizontal kerf adjacent the mine bottom or at various elevations with respect thereto, and connections from said gear to said truck wheels for driving said truck wheels so that said truck may be driven from said gear when said cutting element is in an inverted position.

16. In a mining machine, a truck having wheels and axles thereon and a pairof parallel spaced vertically extending guides on each side thereof, a cutting element supported in said guides for vertical movement with respect to said truck including a motor, a cutter head forwardly of said motor having a cutter bar supported thereon above the top portion of said cutting element for vertical movement with respect to said cutting element and for movement about a vertical pivotal axis, feeding mechanism rearwardly of said motor including truck driving mechanism, said truck driving mechanism including agear driven by said motor and operatively connectible with said truck wheels and axles, means driven from the forward end of said motor for vertically moving said cutting element in said guides, for vertically moving said cutter'bar with respect to said cutting element, and for moving said cutter bar about said vertical pivotal axis, and said cutting element being so arranged that it may be inverted so the cutter bar may project from the bottom thereof instead of the top and cut a horizontal 1 kerf adjacent the mine bottom or at various elevations with respect thereto, and connections from said gear to said truck wheels for driving said truck wheels so that said truck may be driven from said gear when said cutting element is in an inverted position including a gear supported on said truck and a shaft having a relatively loose driving engagement with said gear, and driven from said first mentioned gear in all positions of vertical adjustment of said cutting element with respect to said truck.

17. In a mining machine, a truck having wheels and axles thereon and a pair of parallel spaced vertically extending guides on each side thereof, a cutting element supported in said guides for vertical movement with respect to said truck including a motor, cutting mechanism forwardly of said motor including a cutter head having a cutter bar supported thereon above the top of said cutting element for pivotal movement with respect to said cutting element about a vertical axis, feeding mechanism rearwardly of said motor including truck driving mechanism, said cutting element being so arranged that it may be inverted so the cutter barmay project from the bottom thereof as well as the top, means driven from said motor for moving said cutting element in said vertically spaced guides when in a normal or inverted position, and means for driving said truck from said motor when said cutting element is in a normal or inverted position.

18. In a mining machine, a truck having wheels and axles thereon and a pair of parallel spaced vertically extending guides on each side thereof, a cutting element supported in said guides for vertical movement with respect to said truck including a motor, cutting mechanism forwardly of said motor including a cutter head having a cutter bar supported thereon above the top of said cutting element for pivotal movement with respect to said cutting element about a vertical axis, feeding mechanism rearwardly of said motor including truck driving mechanism, said cutting element being so arranged that it may be inverted so the cutter bar may project from the bottom thereof as well as the top, means driven from said motor for moving said cutting element in said vertically spaced guides when in a normal or inverted position, and means for driving said truck from said motor when said cutting element is in a normal or inverted position including a gear driven by said motor and rotatable about a vertical axis, another gear on said truck operatively connectible with said truck wheels and a shaft having a relatively loose driving engagement with said second mentioned gear and slidable engagement with said first mentioned gear so as to be driven therefrom in all positions of vertical adjustment of said cutting element with respect to said truck.

19. In a track mounted mining machine, a truck having track Wheels and axles thereon and a pair of parallel spaced vertically extending guides on each side thereof, a cutting element supported by said guides for vertical movement with respect to said truck including a motor and a projecting cutter bar, said cutting element being so arranged that it may be inverted so the cutter bar may project from the bottom thereof as well as the top, means driven from said motor for moving said cutting element in said vertically spaced guides when in a normal or inverted position, and means driven by said motor for driving said truck when said cutting element is in a normal or inverted position.

20. In a track mounted mining machine, a truck having track wheels and axles thereon and a pair of parallel spaced vertically extending guides on each side thereof, a cutting element supported by said guides for vertical movement with respect to said truck including a motor and a projecting cutter bar, said cutting element being so arranged that it may be inverted so the cutter bar may project from the bottom thereof as well as the top, means driven from said motor for moving said cutting element in said vertically spaced guides when in a normal or inverted position, and means driven by said motor for driving said truck when said cutting element is in a normal or inverted position comprising a gear driven by said motor and rotatable about a vertical axis, another gear on said truck operatively connectible with said truck wheels and a shaft for driving said second mentioned gear from said first mentioned gear, said shaft having slidable engagement with said first mentioned gear so as to be driven therefrom in all positions :.of vertical adjustment of said cutting element with respect to said truck.

21. In a mining machine, a wheeled truck, a cutting element supported thereon for" vertical movementwith respect thereto including a motor, cutting mechanism disposed forwardly ofv said motor comprising a .projectingcutter bar supported for movement about a vertical pivotal axis and feeding mechanism disposed rearwardly .of said motor comprising truck driving. mechanism and a flexible feeding member, meansdriven from the forward end of said motor for moving said cutter bar about said vertical pivotal axis, other means driven by the forward end of said motor for independently moving said cutting .element towards or away from said truck and means driven from the rearward end of said motor for driving said truck driving mechanism and simultaneously or independently driving said flexible feeding member.

22. In a mining machine, a wheeled truck, a cutting element supported thereon for vertical movement with respect thereto including a motor, cutting mechanism disposed forwardly of said motor comprising a projecting cutter bar supported for pivotal movement about a vertical axis and feeding mechanism disposed rearwardly of said motor comprising truck driving mechanism and a flexible feeding member, means driven from the forward end of said motor for moving said cutter bar about said vertical pivotal axis, other means driven by the forward end of said motor for independently moving said cutting element towards or away from said truck, means driven from the rearward end of said motor for driving said. truck driving mechanism vateither a high or low speed and simultaneously or independently driving said feeding member at either a high or low speed.

23. In a mining machine, a wheeled truck, a cutting element supported thereon for vertical movement with respect thereto including a motor, cutting mechanism disposed forwardly of said motor comprising a projecting cutter bar supported for pivotal movement about a vertical axis and feeding mechanism disposed rearwardly of said motor comprising truck driving mechanism and a flexible feeding member, means driven from the forward end of said motor for moving said cutter bar about said vertical pivotal axis, other means driven by the forward end of said motor for independently moving said cutting element towards or away from said truck and means driven from the rearward end of said motor for drivin said truck driving mechanism and simultaneously or independently driving said flexible feedin member comprising a plural speed planetary gear reduction device.

24. In a mining machine, a wheeled truck, a cutting element supported thereon for vertical movement with respect thereto including a motor, cutting mechanism disposed forwardly of said motor comprising a projecting cutter bar supported for pivotal movement about a vertical axis and feeding mechanism disposed rearwardly of said motor comprising truck driving mechanism and a flexible feeding member, means driven from the forward end of said motor for moving said cutter bar about said vertical pivotal axis, other means driven by the forward end of said motor for independently moving said cutting element towards or away from said truck, means driven from the rearward end of said motor for driving said truck driving mechanism at either a frictio-nally controlled high or low speed and simultaneously or independently driving said feedingv member at. either africtionally controlled high or low speed comprising a plural speed frictionally'controlled planetary gear reduction device.

25. In a mining machine, a track-mounted truck, a cutting element mounted thereon for vertical adjustment with respect thereto including a motor, feeding mechanism rearwardly of said motor including a winding drum having a flexible feeding member thereon, means driven from the rearward end of said motor for driving said winding drum and winding said flexible feeding member thereon and moving said machine at a feedin speed, a projecting cutter bar forwardly of Said motor having a cutter chain movable thereabout and carried-for pivotal movement about a vertical axis, separate drive connections from the forward end of said motor for driving said cutter chain about said cutter bar, for moving said outter bar about said vertical axis, for selectively moving said cutting element towards or away from said truck independently of pivotal movement of said cutter bar, and for vertically adjusting said cutter bar with respect to said motor independently of pivotal movement of said cutter bar or movement of said cutting element towards and away from said truck.

26. In a mining machine, a wheeled truck, a cutting element mounted thereon for I vertical movement with respect thereto including a m tor, a cutter head disposed forwardly of said motor, a cutter bar having a cutter chain movable thereabout supported by said cutter head for movement about a vertical axis and for vertical adjustment with respect to said cutter head, drive connection from the forward end of said motor to said cutter chain, means driven from the forward end of said motor for moving said cutter bar about said vertical axis, means driven from the forward end of said motor for selectively moving said cutting element towards and away from said truck independently of said means for pivotally moving said cutter bar, and other means driven from the forward end of said motor independently of said means for moving said cutting element towards and away from said truck for moving said cutter bar towards and away from said cutter head comprising a pair of threaded members interposed between said cutter head and cutter bar, rotatable means operatively connected with said threaded members, and a selective drive connection from said motor to said rotatable means.

2'7. In a mining machine, a cutting element including a motor, feeding mechanism disposed rearwardly of said motor, cutting mechanism disposed forwardly of said motor including a projecting cutter bar having a cutter chain movable thereabout carried for pivotal movement with respect to said motor about a vertical axis, means driven from the forward end of said motor for driving said cutter chain about said cutter bar including a shaft extending longitudinally of said motor, and other means driven from the forward end of said motor for pivoting said cutter bar about said vertical axis at either a high positioning speed or a low feeding speed including a gear rotatable about an axis parallel to said first-mentioned shaft and driven thereby, a planetary geared speed reduction device coaxial with and driven by said gear and a geared connection from said planetary geared speed reduction device to said cutter bar including a shaft coaxial with said planetary and a self-locking worm and worm gear driven from the forward end of said shaft.

28. In a mining machine, a cutting element including a motor, feeding mechanism disposed rearwardly of said motor, cutting mechanism disposed forwardly of said motor including a projecting cutter bar having a cutter chain movable thereabout carried for pivotal movement with respect to said motor about a vertical axis, means driven from the forward end of said motor for driving said cutter chain about said cutter bar including a shaft extending longitudinally of said motor, and other means driven from said shaft for pivoting said cutter bar about said vertical axis including a gear rotatable about an axis parallel to said first-mentioned shaft and driven thereby, frictionally controlled change speed gearing coaxial with and driven by said gear, a coaxial longitudinal shaft driven thereby and a geared connection from the forward end of said coaxial shaft to said cutter bar.

29. In a mining machine, a cutting element including a motor, feeding mechanism disposed rearwardly of said motor, cutting mechanism disposed forwardly of said motor including a projecting cutter bar having a cutter chain movable thereabout carried for pivotal movement with respect to said motor about a vertical axis, means driven from the forward end of said motor for driving said cutter chain about said cutter bar including a shaft extending longitudinally of said motor, and other means driven from said shaft for pivoting said cutter bar about said vertical axis including a gear rotatable about an axis parallel to said first-mentioned shaft and driven thereby, a planetary geared speed reduction device coaxial with and driven by said gear, a parallel shaft coaxial with said planetary and driven thereby and a geared connection from the forward end of said parallel shaft to said cutter bar.

30. In a mining machine, a cutting element including a motor, feeding mechanism disposed rearwardly of said motor, cutting mechanism disposed forwardly of said motor including a projecting cutter bar having a cutter chain movable 45 thereabout carried for pivotal movement with respect to said motor about a vertical axis, means driven from the forward end of said motor for driving said cutter chain about said cutter bar including a shaft extending longitudinally of said 50 motor, and other means driven from said shaft for pivoting said cutter 'bar about said vertical axis including a gear rotatable about an axis parallel to said first-mentioned shaft and driven thereby, a plural speed planetary geared reduction device coaxial with and driven by said gear,

a parallel shaft coaxial with said planetary and driven thereby, and a geared connection from the 5 forward end of said parallel shaft to said cutter bar.

31. In a mining machine, a cutting element including a motor, feeding mechanism disposed rearwardly of said motor, cutting mechanism dis- 10 posed forwardly of said motor including a projecting cutter bar having a cutter chain movable thereabout carried for pivotal movement with respect to said motor about a vertical axis, means driven from the forward end of said motor 15 for driving said cutter chain about said cutter bar including a shaft extending longitudinally of said motor, and other means driven from said shaft for pivoting said cutter bar about said vertical axis including a gear rotatable about an axis parallel to said first-mentioned shaft and driven thereby, a planetary geared speed reduction device coaxial with and driven by said gear, a parallel shaft coaxial with said planetary and driven thereby and a self-locking geared connection from the forward end of said parallel shaft to said cutter bar including a self-locking worm and worm gear.

32. In a mining machine, a cutting element including a motor, feeding mechanism disposed rearwardly of said motor, cutting mechanism disposed forwardly of said motor including a projecting cutter bar having a cutter chain movable thereabout carried for pivotal movement with respect to said motor about a vertical axis, means driven from the forward end of said motor for driving said cutter chain about said cutter bar including a shaft extending longitudinally of said motor, and other means driven from said shaft for pivoting said cutter bar about said vertical axis including a gear rotatable about an axis parallel to said first-mentioned shaft and driven thereby, a plural speed planetary geared reduction device coaxial with and driven by said gear, a parallel shaft coaxial with said planetary and driven thereby, and a geared connection from the forward end of said parallel shaft to said cutter bar including a worm and worm gear, a pinion driven thereby and a gear operatively connected with said cutter bar and driven by 5 said pinion.

FRANK A. LINDGREN. 

